You can clear an individual entry by using arp -d hostname.

On Sat, Jan 20, 2001 at 09:10:29PM -0600, Brian wrote:
> Is there any way to flush the ARP table on a linux box?  I changed out the
> router for a network and the ARP table wouldn't update.  I finally did an
> arp -s hostname MACaddress to fix it but why can't I just flush it?  I
> tried echo'ing a bunch of crap to /proc/net/arp and it didn't do anything.
> Any ideas?
> 
> -Brian
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-- 
Jim Kaufman		mailto:jmk at kaufman.eden-prairie.mn.us
home: 952-934-4851	fax: 952-937-9832